IBM POWER8

Configuration: IBM Power System S822: IBM POWER8 3690 MHz, 2 sockets (2 chips per DCM (socket), 5 cores per chip, 8 threads per core), 160 GB (DDR3 1600MHz).

64 KB pages mode (64-bit Linux)

  Size        Latency       Increase   Description

  64 K     3                          
 128 K     8               5           + 9 (L2)        
 256 K    10               2
 512 K    12               2           
   1 M    20               8           + 15 (L3)
   2 M    24               4
   4 M    28               4           + 11 (D-ERAT miss)
   8 M    33 +   5 ns      5 +  5 ns
  16 M    36 +  19 ns      3 + 14 ns   + 80 ns (L3-G,RAM) 
  32 M    38 +  31 ns      2 + 12 ns
  64 M    38 +  44 ns        + 13 ns
 128 M    38 +  63 ns        + 19 ns   
 256 M    66 +  74 ns     28 + 11 ns   + 52 (translation cache miss)
 512 M    78 +  81 ns     12 +  7 ns 
   1 G    86 +  89 ns      8 +  8 ns 
   2 G    90 +  99 ns      4 + 10 ns
   4 G    90 + 109 ns        + 10 ns   + 80 ns (RAM)
   8 G    90 + 128 ns        + 19 ns   
  16 G    90 + 177 ns        + 49 ns
  32 G    90 + 228 ns        + 51 ns   + 80 ns (RAM)
  64 G    90 + 300 ns        + 72 ns   

Links

Power8 at Wikipedia